/Engine/Source/Runtime/CoreUObject/Public/Misc/PackageName.h
Checks if the package exists in IOStore containers, on disk outsode of IOStore, both, or neither
the set of locations where the package exists (IoDispatcher or FileSystem, both or neither)
static [EPackageLocationFilter](API\Runtime\CoreUObject\Misc\FPackageName\EPackageLocationFilter) DoesPackageExistEx ( const [FPackagePath](API\Runtime\CoreUObject\Misc\FPackagePath) & PackagePath, [EPackageLocationFilter](API\Runtime\CoreUObject\Misc\FPackageName\EPackageLocationFilter) Filterconst, bool bMatchCaseOnDisk, [FPackagePath](API\Runtime\CoreUObject\Misc\FPackagePath) * OutPackagePath )